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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4526eb1b540d2cc15f5f7ec98c6bf4a57cac87155b10b34f1e443e249691570c' 
  AND token = 'Oy0uW8F63Pk03C8lSJtbdXpcadCF+oIXTARaA2N82xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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