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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb20f5ea31321b08f1e38b61f980cc849a4e7212f27a889d72d3de6003b23f4f' 
  AND token = 'uIz7MkR87WD6CXe1stbavU3rI9+4J/LtldyLo6AMftU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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