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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b96f84bb4e07b0f48a416a837b10f2171f26b529e89f36e0427593915634c4' 
  AND token = 'UqEcmFTQ/kVmtF7SUnUDouRQ0xInib6QXRGgT69rskM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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