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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f5da32efbec22c6a1e03464695e5f087fa60d15d0c0f76c649eecd9e4b70e5' 
  AND token = 'BRWU5kavASkkMr4HTTq2aczGe4wIrA84KZSXoehAto4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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