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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e87ba244a374068c48af6e90c6596c37ac5937a7ad1670a86168cdb6ee18f5' 
  AND token = 'ZoPLkXE0ukFa8ogd0YW91kD5DeRAloTypsxxrm9lUA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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