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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4db720106c471d688fd5c64d2a38912db4267d5620cf2661d93af4d3c70548f' 
  AND token = '9vG4F5DAzcsqK6d/dntrVSIO8+2kYKkvx6mk4Debef0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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