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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbea83e95c56b2b8156bb56a50296f1c2b597da8f4367cf2acf215c0c4826aca' 
  AND token = 'KVOV2vXTThE2/BbVtLWzdAzwR8y07XBfuuFFpnUv0mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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