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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326229fc87160c91e60c099bbbfa399845a69e728745ebec79b16d2481f5e662' 
  AND token = 'yL2voiRr0nxvb1nw5KDnc4hgYLJ4A+lxP5NYFxMbRtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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