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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c0014602fb34e801a39332a815aa77c22e9c0dc73f9d1c68e4ec13fba58fb8' 
  AND token = '9RTx5yZHw37OsrLXR+d2A2AS9o4pn92fXvgxCGPNI4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}