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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b783a4d30c29b2dc84f8038d75634abd2cf4ccee8798f4386e99e811c94296c6' 
  AND token = '9WFrYevDQymMQ+oECjQUbGiA+c1kQThH15TGAV05yzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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