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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a45bbb35d65f7f16806e35083b6dbbdf410f3732f9e115f4d0c3eff41529e5' 
  AND token = 'LC7jiF31V6wy12EIzNBJaUHUpt9YzS8yx5Tn48aBkxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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