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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f408d0d56170635cafb883b5028cf2ec7f107176628ec2f5eb70b506b13b2143' 
  AND token = 'GY45lpzbpuxcGbGxY/pij1NsQs6VEfmEg9042li3fvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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