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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684acc2dc63081a341e377ac75777401322f63be387dc9bdc14f4e092ade0623' 
  AND token = '7J1s2fMYlMxpllNEqxlm6t6T7uspiQjz2PgdORKs7BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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