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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61cb3883f69634b52ad3b8ac22b6967f9cfabb56a0dd24bfead870c677a4bf6b' 
  AND token = 'w5j/csCFLu1su3T5jgmDs2DRo3gnYu5nr45bHLp9j2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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