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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179c947828fcdbee5dcfc2db81e1956ed91412b01d44f14aa0703993e00f8587' 
  AND token = '36+wa/HV3q0xY8S06Ui0ZpHqS1hPdAxvbIEADHC0CYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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