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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e0f2509ae53f221f4bb8f1a03596f43dd8bf01daca45c40b1e7b159b0f266b' 
  AND token = 'VSK/Ue2jQpyRSZaRa59ZK9aSp1i0Qo72hArRE1ZvHpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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