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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba0a0667d052583e4bee4a8ec5034e5e2bba1386bf77f29d0150a71c3cdbb42' 
  AND token = 'ML6hZT52V1fhajNtldz4+BOBe4wMGDyczs8ll3sS3zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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