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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f143095bbc41f8a337d4995dd205757b0963043bcc00bef4971492af7670508e' 
  AND token = 'iPxGDrPUUVmWgJdMcXTV326AYxycW+wDyCyUXPwZN+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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