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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1a0432b0996045680c3360594475980e9bcfe29d585939c52ee7ae803e0aba' 
  AND token = 'PsSiYEBX4MUeiZ2c7Ec/9XZNfKApUQOWve+IxNUvS0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00121

JSON explain

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