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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eadda2ab1b539df5e4ea211f44b29f67009768d69ff809bf8131b5ef66932708' 
  AND token = 'o8nU/r6jd96Dhu89p5FbJzaNfeB2ojwiTmIDn+z3yAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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