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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615c5533feb5431992413a5e7dbb9005dc9bee0144f28cafc23af0de0ce429b3' 
  AND token = 'jAu2PveXn/NSQWQpvemYL2nO7iTjlEnU7JNSx4e0dN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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