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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a83ff58625a3e9fc33a3b5364c8536bed05ac8e15fe12c16939f6396702fb15' 
  AND token = '1iG64OGLt2WnDab59p+31MAjx72qK3HdyzCDYVbY9Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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