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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed64bf894349300b4ca73b95eaa6440f8d720820ddb4b73e7c2777d84844d56' 
  AND token = 'FfI99I5AH/Oih/z5RFLiIecn/4o9kZfwOWC75EuO8p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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