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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9faebefea722b1dfc5787bc5c2f149ed129e83e889cde0850bcf5b63224b7d2a' 
  AND token = '4yYKNkpl+bu8SXD2F6f590Q7GvQzD/b+UkwnnKAz19c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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