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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db9b35e4229cf3e4f6230f8d613260a6e6e08910f00053a4be6159364cc55c7' 
  AND token = 'J2eUR6hjcVdtiU9zpjH2Fm/arxdAm7DHB1niqdCXJEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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