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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c33e4ba92a2ab8e3b3d19d429d4a9ae34b42ae47b8252e74f555909e8093ab' 
  AND token = 'enpzsrW/1+QXLNcgGuPYKmEXi3hBqtVMVfflFAS3qxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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