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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd2f98570cd7be114c62cbc91c0fdd2f9bc659f5346d794c04a0af699ac7975' 
  AND token = 'c6LAR1rK8vVzr5ESiFgaitpbDapo3c3oA09n3YN5X4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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