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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e754c2465c6ed936ac5780fef40fa46ef11da925e25efde44e49600fc1644e' 
  AND token = '4TRDhTFqK6NiMpByWXHdK93Wr/Iw96mh03qUdot7emE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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