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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc27013c3f43f1cc0db01ef2af3a29622c5a17ee9e3acd3d4b105c3b40e001b' 
  AND token = '1j/0ugofknI7iscJpRElZ229FQZGIIR+TiM03FHDkzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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