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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a42fee171a53905eca14faef3ae82ec9c90673a0b0e5917bdd1422824ff9e6' 
  AND token = 'U5b6NixxAwSsPvNB29QmJmXiVtNIz8Fs7yIzopjNti8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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