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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1103fe59caa09c2f96e38b14377b54bdb49eedacef53cf9bec4f9568986d5eb0' 
  AND token = '9B4l+ub91a5GOYV0iCdf0cgyDb9CW00JbeQVsjulGnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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