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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01345d747a2ec66533c622a8310060f34b4fd9bf60bdc75596e1f64bf3aaf612' 
  AND token = 'fGVYW8Sl0YRTxuLJhnrySh/UYfQHcmR3O6+CztOY1lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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