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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08dd1e90772fd25a45eb9f0fe51f64a84a724f7af22e9c9e04c44be900f79f6' 
  AND token = 'fPs2Lbh/xtceWTnPV6LNYLWhT9GAYRuJMuVJBYvi2dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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