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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb296002e65395e9de6d69cebadffeae03ddc9c2cc24b7cf7bf691406cf0bfd' 
  AND token = 'RcBk3nJeS9VdwBKyKRbZcNCgpLcrqyt20ikrAJENGFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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