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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ef3e23d027bb885033830d9f0beeeb22b6e007c4066e0f6d8239f9f92a2066d' 
  AND token = 'sxGeGyy/Dg8fY+09JZnPQ8MQG4SUCsOuVQTrnJXk3Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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