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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06814c53e34886bb283f01b78018b0ea052d2794d0a6d7dc20300a898f0ffc2' 
  AND token = 'Hk2d0Wz5/dfF+zxC4fX+EE1PHxVXZ0aukqLrnGncbnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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