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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4324bd4363696982ff1e52498d89347f0f7c823438cda4288a7ff57e45c2f37b' 
  AND token = 'DSIIvhElI/Z4NXNInHK90h1FKxRf+t+vHFmcNRXdaHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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