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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d942e6a0d16b9f8dbca5563be4a2cb74d77197cc8df5d3ab2a814b018cb7c0' 
  AND token = 'pAserR6vNd3Gxzl/Fu32uKNdA9uMFagIQ5lmfXcAu34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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